Reaction products of epihalohydrin and polymers of diallylamine and salts thereof and their use in paper

ABSTRACT

WATER-SOLUBLE, ALKALINE CURING RESINS WHICH ARE THE REACPRODUCTS OF AN EPIHALOHYDRIN AND A POLYMER OF A DILLYLAMINE ARE DISCLOSED. THE RESINS ARE PARTIALLY USEFUL AS WET STRENGTH AGENTS FOR PAPER AND ADDITIONALLY GIVE SUPERIOD DRY STRENGTH TO PAPER.

United States Patent Us. or. zen-29.6 CM 14 Claims ABSTRACT OF THE DISCLOSURE Water-soluble, alkaline curing resins which are the reaction products of an epihalohydrin and a polymer of a diallylamine are disclosed. The resins are particularly useful as wet strength agents for paper and additionally give superior dry strength to paper.

This application is a division of my application U.S. Ser. No. 30,986, filed Apr. 22, 1970, and now US. Pat. 3,700,623, which is in turn a continuation-in-part of my prior US. application Ser. No. 5,956, filed Jan. 26, 1970, and now abandoned.

This invention relates to water-soluble, alkaline curing resins and more particularly to the water-soluble resinous reaction products of a polymer of a diallylamine or an N-substituted-diallylamine and an epihalohydrin, and to their use in the manufacture of paper having good wet strength properties and good dry strength properties.

It is known that the hydrohalide salts of the diallylamines and the N-alkyldiallylamines can be homopolymerized or copolymerized using free radical catalysts to give water-soluble, linear polymer salts which yield on neutralization the free bases or free amine polymers.

It is also known from Keim, US. Pat. 2,926,154 and from Earle, Jr., US. Pat. 3,240,664 that water-soluble, alkaline curing resins can be prepared by reacting epichlorohydrin with long chain polyamides containing secondary amino groups or with polyaminoureylenes containing tertiary amino groups under alkaline conditions. These resins when used for the wet strengthening of paper are fast curing on the machine and do not require an aging period or treatment at elevated temperature in order to obtain significant wet strength development.

Now, in accordance with this invention it has been found that fast curing, efiicient, water-soluble cationic thermosetting resins can be prepared by reacting an epihalohydrin, and particularly epichlorohydrin, with polymers of certain amines, and that the resins so produced provide all of the advantages of the prior art resins and additionally give superior dry strength to paper.

Accordingly, the present invention relates to the watersoluble resinous reaction product of (A) a linear polymer having units of the formula 3,833,531 Patented Sept. 3, 1974 preferably methyl, ethyl, isopropyl or n-butyl. R of the formula represents hydrogen, alkyl or substituted alkyl groups. Typical alkyl groups, which R' can be, contain from 1 to 18 carbon atoms and preferably from 1 to 6 carbon atoms and include methyl, ethyl, propyl, isopropyl, butyl, tert-butyl, hexyl, octyl, decyl, dodecyl, tetradecyl, octadecyl and the like. The R can also be a substituted alkyl group. Suitable substituents include, in general, any group which will not interfere with polymerization through a vinyl double bond. Typically, the substituents can be carboxylate, cyano, ether, amino (primary, secondary or tertiary), amide, hydrazide, hydroxyl and the like.

Polymers having units of the above formula can be produced by polymerizing the hydrohalide salt of a diallylamine where R and R are as indicated above, either alone or as a mixture with other copolymerizable ingredients, in the presence of a free radical catalyst and then neutralizing the salt to give the polymer free base.

Specific hydrohalide salts of the diallylamines which can be polymerized to provide the polymer units of the invention include diallylamine hydrochloride N-methyldiallylamine hydrobromide 2,2'-dimethyl-N-methyldiallylamine hydrochloride N-ethyldiallylamine hydrobromide N-isopropyldiallylamine hydrochloride N-n-butyldiallylamine hydrobromide N-tert-butyldia-llylamine hydrochloride N-n-hexyldiallylamine hydrochloride N-octadecyldiallylamine hydrochloride N-acetamidodiallylamine hydrochloride N-cyanomethyldiallylamine hydrochloride N-B-propionamidodiallylamine hydrobromide N-acetic ethyl ester substituted diallylamine hydrochloride N-ethylmethylether substituted diallylamine hydrobromide N-fi-ethylaminediallylamine hydrochloride N-hydroxyethyldiallylamine hydrobromide and N-aceto-hydrazide substituted diallylamine hydrochloride.

Diallylamines and N-alkyldiallylamines, used to prepare the polymers employed in this invention, can be prepared by the reaction of ammonia or a primary amine with an allyl halide employing as a catalyst for the reaction a catalyst that promotes the ionization of the halide such, for example, as sodium iodide, zinc iodide, ammonium iodide, cupric bromide, ferric chloride, ferric bromide, zinc chloride, mercuric iodide, mercuric nitrate, mercuric bromide, mercuric chloride, and mixtures of two or more. Thus, for example N-methyldiallylamine, in good yield, can be prepared by reaction of two moles of an allyl halide, such as allyl chloride, with one mole of methylamine in the presence of an ionization catalyst such as one of those enumerated above.

In preparing the homopolymers and copolymers for use in this invention, reaction can be initiated by redox catalytic system as indicated in Example 5. In a redox system, the catalyst is activated by means of a reducing agent which produces free radicals without the use of heat. Reducing agents commonly used are sodium metabisulfite and potassium metabisulfite. Other reducing agents include water-soluble thiosulfates and bisulfites, hydrosulfites and reducing salts such as the sulfate of a metal which is capable of existing in more than one valence state such as cobalt, iron, manganese and copper. A specific example of such a sulfate is ferrous sulfate. The use of a redox initiator system has several advantages, the most important of which is efiicient polymerization at lower temperatures. Conventional peroxide catalysts such as tertiary-butyl hydroperoxide, potassium persulfate, hydrogen peroxide, and ammonium persulfate used in conjunction with the above reducing agents or metal activators, can be employed.

As stated above, the linear polymers of diallylamines which are reacted with an epihalohydrin in accordance with this invention can contain different units of formula (I) and/or contain units of one or more other copolymerizable monomers. Typically, the comonomer is a different diallylamine, a monoethylenically unsaturated compound containing a single vinylidene group or sulfur dioxide, and is present in an amount ranging from O to 95 mole percent of the polymer. Thus the polymers of diallylamine are linear polymers wherein from to 100%;' of the recurring units have the formula (I) and from 0 to 95% of the recurring units are monomer units derived from 1) a vinylidene monomer and/or (2) sulfur dioxide. Preferred comonomers include acrylic acid, methacrylic acid, methyl and other alkyl acrylates and methacrylates, acrylamide, methacrylamide, acrylonitrile, methacrylonitrile, vinyl acetate, vinyl ethers such as the alkyl vinyl ethers, vinyl ketones such as methyl vinyl ketone and ethyl vinyl ketone, vinyl sulfonamide, sulfur dioxide or a different diallylamine embraced by the above formula (II).

Specific copolymers which can be reacted with an epihalohydrin include copolymers of N-methyldiallylamine and sulfur dioxide; copolymers of N-methyldiallylamine and diallylamine; copolymers of diallylamine and acrylamide; copolymers of diallylamine and acrylic acid; copolymers of N-methyldiallylamine and methyl acrylate; copolymers of diallylamine and acrylonitrile; copolymers of N-methyldiallylamine and vinyl acetate; copolymers of diallylamine and methyl vinyl ether; copolymers of N-methyldiallylamine and vinylsulfonamide; copolymers of N-methyldiallylamine and methyl vinyl ketone; terpolymers of diallylamine, sulfur dioxide and acrylamide; and terpolymers of N-methyldiallylamine, acrylic acid and acrylamide.

The epihalohydrin which is reacted with the polymer of a diallylamine can be any epihalohydrin, i.e., epichlorohydrin, epibromohydrin, epifluorohydrin or epiiodohydrin and is preferably epichlorohydrin. In general, the epihalohydrin is used in an amount ranging from about 0.5 mole to about 1.5 moles and preferably about 1 mole to about 1.5 moles per mole of secondary plus tertiary amine present in the polymer.

The resinous reaction products of the invention can be prepared by reacting a homopolymer or copolymer of a diallylamine as set forth above with an epihalohydrin at a temperature of from about 30 C. to about 80 C. and preferably from about 40 -C. to about 60 C. until the viscosity measured on a solution containing 20% to 30% solids at 25 C. has reached a range of A to E and preferably about C to D on the Gardner-Holdt scale. The reaction is preferably carried out in aqueous solution to moderate the reaction, and at a pH of from about 7 to about 9.5.

When the desired viscosity is reached, sufiicient water is added to adjust the solids content of the resin solution to about 15% or less and the product cooled to room temperature (about 25 C.). The resin solution can be used as such or, if desired, can be adjusted to a pH of at least about 6 and preferably to a pH of about 5. Any suitable acid such as hydrochloric, sulfuric, nitric, formic, phosphoric and acetic acid can be used to adjust the pH.

The aqueous resin solutions can be applied to paper or other felted cellulosic products by tub application or by spraying, if desired. Thus, for example, preformed and partially or completely dried paper can be impregnated by immersion in, or spraying with, an aqueous solution of the resin, following which the paper can be heated for about 0.5 minute to 30 minutes at temperatures of C. to C. or higher to dry same and cure the resin to a water-insoluble condition. The resulting paper has greatly increased wet and dry strength, and therefore this method is well suited for the impregnation of paper such as wrapping paper, bag paper and the like, to impart both wet and dry strength characteristics thereto.

The preferred method of incorporating these resins in paper, however, is by internal addition prior to sheet formation, whereby advantage is taken of the substantivity of the resins for hydrated cellulosic fibers. In practicing this method, an aqueous solution of the resin in its uncured and hydrophilic state is added to an aqueous suspension of paper stock in the beater, stock chest, Jordan engine, fan pump, head box or at any other suitable point ahead of sheet formation. The sheet is then formed and dried in the usual manner.

The oif-the-machine wet strength obtained with the resins of the invention will be satisfactory for most applications. Additional wet strength can be obtained by subjecting the paper to a heat treatment. Satisfactory temperatures will be of the order of from about C. to about C. for a period of time from about 12 to 60' minutes, time varying inversely with temperature.

While the reaction products herein described impart substantial wet strength to paper they also improve the dry strength of paper by as much as 40% or more when present therein in relatively small amounts, i.e., about 0.01% or more, based on the dry weight of the paper. Generally, it will be desirable to use from about 0.l3% by weight, based on the dry weight of the paper. However, amounts up to 5% or more by weight, based on the dry weight of the paper, can be used if desired.

The following examples illustrate the invention. All percentages are by weight unless otherwise indicated.

EXAMPLE 1 Part 1.A poly(diallylamine hydrochloride) is prepared as follows. Into a pop bottle equipped with a magnetic stirring bar and containing 117 grams (0.88 mole) of diallylamine hydrochloride, is injected 224 grams of dimethyl sulfoxide to give a 35% solution. The bottle and contents are cooled in an.ice bath, and 5.85 grams of ammonium persulfate as a 33% solution in dimethyl sulfoxide is introduced into the bottle. The bottle is evacuated and filled with nitrogen five times and then the bottle contents are allowed to warm to room temperature. The bottle is next immersed in a 30 C. bath and maintained therein for 96 hours, after which time the bottle is removed from the bath and vented. The contents are poured into a large volume of acetone, yielding a light tan, hygroscopic solid. The solid is separated from the acetone by centrifugation, washed withacetone, filtered and dried at 50 C. under vacuum. The product (59 grams) is water-soluble, has a reduced specific viscosity (RSV) of 0.21 as determined on a 0.1% solution in aqueous 1 molar sodium chloride at 25 C.

and contains :by analysis, 16.05% nitrogen and 21.52%v

having a pH of 0.9. One molar'aqueous sodium hydrox ide is added to the solution to adjust the pH- to 8.5, and the solution is transferred to a reaction flask equipped with a thermometer, stirrer and heating mantle. Next 14.8 grams (0.16 mole) of epichlorohydrin is added to the flask and sufficient water is introduced to give a reaction medium of 30% reaction solids. The contents of the flask are then raised to 50 C. and maintained thereat for 30 minutes, after which time the solution is cooled and diluted to 5% solids. Portions of the solution are adjusted to a pH of 7.0 and 5.0 using 1.0 molar hydrochloric acid and are evaluated in 'Rayonier bleached kraft pulp for wet-strengthening properties. The procedure utilized in the evaluation is as follows:

Rayonier bleached kraft pulp is beaten at 2.5% consistency in a cycle beater to 840 cc. Schopper-Riegler freeness. The pulp is diluted to 0.28% consistency in the proportioner of a standard Nobel & Wood handsheet machine. The products to be evaluated are added to the proportioner as 2% solids solutions to give 1.0% product based on pulp. The pulp stock is then formed into handsheets having a basis weight of 40 pounds/ream, and the sheets are dried on a drum drier to a moisture content of about 5%. A portion of the resulting handsheets are given an additional cure by heating one hour at 105 C. The sheets tested for wet strength are soaked for 2 hours at 25 C. in distilled water prior to testing. Paper from pulp treated with the product solution adjusted to a pH of 7.0 has a Wet tensile strength of 2.15 pounds/inch width, uncured, and 3.99 pounds/inch width, cured. Paper from pulp treated with the product solution adjusted to a pH of 5.0 has a wet tensile strength of 1.94 pounds/ inch width, uncured, and 3.58 pounds/inch width, cured.

EXAMPLE 2 The procedure of Example 1 is repeated except that in this example the polymer which is reacted with epichlorohydrin is poly(N-methyldiallylamine hydrochloride). The poly(N-methyldiallylamine hydrochloride) is prepared in the manner of Part 1, except that 54.5 grams of N- methyldiallylamine hydrochloride are substituted for 117 grams f diallylamine hydrochloride and 101.5 grams of dimethylsulfoxide and 3.53 grams of ammonium persulfate are used. The polymer (18 grams) is watersoluble, has an RSV of 0.31 as measured on a 0.1% solution in aqueous 1 molar sodium chloride at 25 C. and contains by analysis 9.21% nitrogen. This polymer (14.05 grams; equivalent to 0.094 mole of monomer unit) is dissolved in 22 grams of Water to give an orange viscous solution of pH 1.0 and the solution, after pH adjustment to 8.5, is reacted with 12.95 grams (0.14 mole) of epichlorohydrin following the procedure of Part 2 except that the reaction temperature is 50 to 53 C. and the diluted solution (5% solids) is adjusted to a pH of 7.0. Evaluation of the product of this example in pulp according to the procedure of Example 1 gives a. wet tensile strength of 4.34 pounds/inch Width, uncured, and 6.24 pounds/ inch width, cured.

If the resinous product contains epoxide groups, as in the case of homopolymers or copolymers of the N-substituted diallylamines, it is desirable to stabilize the aque ous resin solution by the addition thereto of a watersoluble acid, preferably a hydrogen halide acid, such as hydrochloric acid, in an amount suflicient to convert the secondary or tertiary amino groups to the corresponding amine salts and to cause halide ions to react with the epoxy groups to form halohydrin moieties. Water-soluble acids, other than hydrogen halide acids, can be used if the halide ion concentration of the reaction mixture is sufliciently high, e.g., at least 0.1N, and the reactivity or nucleophilicity of the acid anion is sufficiently low that the epoxide groups are converted essentially completely to the halohydrin. Examples of suitable hydrogen halide acids are hydrochloric acid, hydrobromic acid, hydrofluoric acid and hydroiodic acid. Examples of other water-soluble acids that can be employed include sulfuric acid, nitric acid, phosphoric acid, formic acid and acetic aid. All the acid can be added at once or it can be added in increments or continuously over a period of time, e.g. 5 to 120 minutes,

while heating at temperatures of from about 40 C., to about C., or over a period of several days to several Weeks at room temperature. Once the resin is effectively stabilized, the pH can be adjusted to within the range of about 2.0 to 7.0 with a base to prevent irreversible hydrolysis of the polymer backbone. Suflicient water is then added to adjust the solids content of the aqueous resin solution to the desired amount.

The amount of acid required will usually approach stoichiometric equivalence to the amount of epihalohydrin used to prepare the resin. However, satisfactory results are obtained if the ratio of equivalents of acid to equivalents (moles) of epihalohydrin is from about 0.3 to about 1.2.

The acid stabilized resins prepared from polymers of the N-substituted diallylamines are unique in that they can be dried in conventional manner, as by spray drying, freeze drying, roll drying, oven drying or vacuum drying techniques.

The stabilized resins prior to use, if in dry form, are redissolved in water and the solution adjusted to the desired solids content. The solutions are then activated for use by adding an amount of base, either as a solid or as a solution, suflicient to reconvert the halohydrin groups to epoxides. This will usually require an amount of base approximately chemically equivalent to the amount of stabilizing acid present. However, from about 0.25 to about 2.5 times this amount can be used. Both organic and inorganic bases can be used for activation. Typical bases which can be used are the alkali metal hydroxides, carbonates and bicarbonates, calcium hydroxide, pyridine, benzyltri methylammonium hydroxide, tetramethylammonium hydroxide, tetraethylammonium hydroxide, and mixtures thereof.

The following examples illustrate further embodiments of the invention.

EXAMPLE 3 Part 1.-A copolymer of N-methyldiallylarnine hydrochloride and sulfur dioxide is prepared as follows. Into a reaction flask equipped with cooling means is introduced a solution of 30.3 grams of N-methyldiallylamine in 156 grams of acetone and a pre-cooled solution of 13.5 grams of sulfur dioxide in grams of acetone. The monomer mixture is cooled to about 20 C. after which 0.85 gram of tert-butyl hydroperoxide catalyst as a 5% solution in acetone is added dropwise to the monomer mixture over a period of 2 hours, cooling being employed to maintain the temperature at about 20 to 25 C. The white precipitate which formed is separated from the recation medium, is washed thoroughly with acetone and then is dried in a vacuum oven at 50 C. overnight. The product (46 grams) is water-soluble and has an RSV of 0.47 (determined on a 0.1% solution in aqueous 0.1 molar sodium chloride at 25 C.). Elemental analysis indicated that the copolymer is a 1:1 molar copolymer.

Part 2.An N-methyldiallylamine-sulfur dioxide copolymer-epichlorohydrin is prepared as follows: 22.45 grams (equivalent to 1.05 moles of the diallylamine monomer units) of the copolymer prepared in Part 1 of this example is dissolved in 50 grams of water in a reaction flask to give a light yellow solution having a pH of 1.2. After adjustment of the pH of the solution to 7.1 with one molar aqueous sodium hydroxide, 14.6 grams (1.58 moles) of epichlorohydrin and then 32 grams of water are added to the solution, giving 25% reactions solids. The contents of the flask are heated to 40 C. and the reaction monitored by determining the viscosity of a 25 solids solution at 25 C. using Gardner-Holdt viscosity tubes. Within 15 minutes the viscosity has reached about D on the Gardner-Holdt scale, and the reaction is essentially terminated by adding 4 grams of 1 molar hydrochloric acid and 412 grams of water and cooling. The resin solution contains 5.2% total solids and has a pH of 3.7. An additional amount of one molar hydrochloric acid is added to adjust the pH to 3.0.

7 EXAMPLE 4 The procedure of Example 1 is repeated except that in this example the polymer which is reacted with epichlorohydrin is a 1:1 molar copolymer of N-methyldiallylamine tion is transferred to a reaction flask equipped with a thermometer, stirrer and heating mantle and 1.0 gram (11 millimoles) of epichlorohydrin is added to the flask along with sufiicient water to give a reaction medium of 12.5% solids. The contents of the flask are then heated to 5556 and dimethyldiallyammonium chloride. The copolymer is 5 prepared according to Example 1, Part 1 except that a i 52; ig gg l i mixture of 35 grams of N-methyldiallylamine hydro- Vlscoslty O a 3 S01 8 Sou at uslilg chloride and 35 grams of dimethyldiauylammonium Gardner-Holdt viscosity tubes. After 70 mlnutes, the VIS- chloride is substituted for the 117 grams of diallylamine gggg i fg gg g g g gg g s i g f 3? 2 hydrochloride, and 125 grams of dimethylsulfoxide are 10 d 111 d 65 y d used. The copolymer (30 grams) is water-soluble, has an p i an H i i g o Wa er an coo 6 RSV of 0.21 (determined on a 0.1% solution in aqueous resm so u Ion as a p 0 0.lalmola0sodi11Jm chloride at 25 C.) and contains bg A LE 6 an ysrs mo ar percent quaternary amine groups an 50 molar percent tertiary amine groups. This copolymer proceflure of iixample 5 g i (26.65 grams; equivalent to 0.086 mole of diallyamine t at m i eiiamp h i ymer 1c monomer units) is dissolved in 50 grams of water to give reacted Wlth eplchloro ydlim 1S cope ymer 0 a viscous tan solution of pH 1.2. The pH of the solution acrylamlde and .N'methyldlauylamm? hydrochloride is adjusted to 8.5 with 1 molar aqueous sodium hy- The copolymer 15 prepared accordmg to Example droxide, and then 11.8 grams of epichlorohydrin and 19.6 P 1 excePt that of gi fi grams of water are added to the solution to give 30% amine 1S Substltuted i t e grams 0 la reaction solids. The contents of the flask are heated to The cppolymer water'soluple h an RSV 0 45 C. and the reaction continued to a Gardner-Holdt (deteirmmed on a 13% sohgitlon aqueousl viscosity value greater than B, at which time the reaction molar 5051mm sulfate at an contams by {ma .ysls is terminated by adding 5 grams of 1 molar hydrochloric 25 .mtrogem 20'21% oxygen 456% E acid and 520 grams of water. The resin solution conmdlcatmg that the coplymer contams welght Percent tains 3 9% total solids and has a PH of N-methyldiallylamine hydrochloride umts. This copolymer (7 grams; equivalent to 8 millimoles of the N-methyl- EXAMPLE 5 diallylamine monomer units) is dissolved in 50 grams of Part 1.A copolymer of acrylamide and diallylamine Water. and one molar aqueous Sodium hydroxide: added hydrochloride is prepared as follows. An open reaction to adlust the P 1 NeXt grams mllllmoles) vessel equipped with a mechanical stirrer is charged with of eplchlProhydnP and gram? of WQteT are added to 5 grams of diahylamihe, 125 grams f water and 5 the solution to give 12.5 reaction SOlldS. The contents grams f concentrated hydrochloric acid, the PH being of the flask are heated to 5556 C. and the reaction is approximately 4.5. To the vessel is then added 62.5 grams colltmuifd to a G?IdncrH1dt P Y value, of at of acrylamide dissolved in 112 grams of water. The conwhlfilh tlme (30 mmutes) the reactlon lsfierlqmated by tents of the vessel are thoroughly mixed and there is addmg grams of 1 molar bydrochlonc acld and 87 added to the vessel with stirring 15 grams f a 1 aque grams of Water. The resm solution has a pH of 2.2. ous solution of ferrous ammonium sulfate, followed by 0.25 gram ofa 1% aqueous solution of potassium meta- 40 EXMPLES bisulfite and 0.25 gram of a 1% aqueous solution of am- Portwns of the eplchlorohydrm-qopolymer reactwp monium persulfate, the latter 2 solutions being added products of Examples t0 a actlvated by the addlsimultaneously and dropwise. The reaction proceeds U011 0f sodlllifl hydl'oxlde t0 glve P 0f 10 and then exothermically starting at ambient temperature (27 (3,) are evaluated 1n handsheets accordlng to the general proand rises to 61 C. at which temperature heat ceases to cedure of Example 1. The results of these examples are be evolved. The resulting copolymer solution is cooled by summarized below in Table I.

TABLE 1 Percent Activated 315:3 Wet tegiijltefilbfin; Dry tenvrisggfilblin:

851R irom based Basis Burst Ex. Example on pulp weight Unoured Cured Uneured Cured (p.s.i.)

7 3 1.0 41.8 8.80 8.21 27.2 56.5 8 4 1.0 41.7 5.85 6.31 9 5 0.5 39.8 2.12 2.80 1o 5 1. 0 39. 2 2. 52 3.28 11 5 2. 0 39.1 2.62 3. 22 12.. e 0.5 39.2 3.28 13.56 13"--- 6 1.0 40.0 r 3.42 4.02 14...--- 6 2.0 39.8 3.501 4.16 .2

diluting to about 6% copolymer solids. A portion of the 0 EXAMPLE 15 solution is dialyzed against distilled water and then freeze Part 1 A o poly( s-propronamrdodrallylamlne hydro- 5E3 a jggi fii g fif gs fi g gg gfi 5235313523 chloride) is prepared as follows. To a reaction vessel charged with 213 grams (3 moles) of acrylamide dis- ,1 3 9, sohclltlon i 'g gg solved in 213 grams of distilled water is added with stir- 327 an 3 5 2 g 65 ring over a one hour period 291 grams (3 moles) of di- 0 oxygen an 0 c 9 6 m F allylamine. The temperature of the reaction mixture rises the copolymer contains 19.6 weight percent drallylamme to 600 c. and is maintained thereat for an additional 6 hydrochlonde hours after which time the mixture is cooled and a total P from the above p y of 715 grams of B-propionamidodiallylamine is recovered p y l 15 P p follows: 5 grams y as a yellow solution. A mixture of 47.7 grams (0.2 mole) lent to 7-5 0f dlallylifmllle monomef Units) of the above solution and 19.4 grams (0.2 mole) of conof the sohd p y of dlallylamme yd o and centrated hydrochloric acid is introduced into a pop botacrylamide isolated above in Part 1, is dissolved in 40 tle equipped with a magnetic stirring bar and the bottle grams of water and one molar aqueous sodium hydroxide contents sparged with nitrogen for 1 hours. Next 0.5 gram is added to the solution to adjust the pH to 8.5 The soluof tert-butyl hydroperoxide is added and the bottle immersed in a 60 C. bath and maintained therein for 24 hours, after which time the bottle is removed from the bath, cooled and vented. The product is an extremely viscous, orange-red solution which contains 60.7% solids and by analysis 8.33% nitrogen and 10.5% chloride ion, and has an RSV of 0.23 as determined on a 1% solution in aqueous 1 molar sodium chloride at 25 C.

Part 2.-A poly(B-propionamidodiallylamine)-epichlorohydrin resin is prepared as follows: 43 grams (equivalent to 0.128 mole of B-propionamidodiallylamine hydrochloride monomer units) of the poly({3-propionamidodiallylamine hydrochloride) solution prepared above in Part 1 isadjusted to a pH of 8.5 with one molar aqueous sodium hydroxide (about 59 grams). The solution is transferred to a reaction flask and 26.5 grams of water and then 17.8 grams (0.192 mole) of epichlorohydrin is added to the flask. The contents of the flask are then heated to 40 C. and the reaction monitored by determining the viscosity using Gardner-Holdt viscosity tubes. After 1 hour the viscosity has reached C on the Gardner-Holdt the solution to 7.7 with ten molar and then one molar aqueous sodium hydroxide, 8.2 grams of epichlorohydrin and 21 grams of water are added to the solution giving 25% reaction solids. The contents of the flask are heated to 35 to 37 C. and the reaction is monitored by determining the viscosity using Gardner-Holdt viscosity tubes. The reaction is terminated when the viscosity has reached H on the Gardner-Holdt scale by adding 3 grams of 1 molar hydrochloric acid and 470 grams of water and cooling. The resin solution contains 4.42% solids. Additional amounts of one molar hydrochloric acid are added periodically to maintain the pH at 2.5.

EXAMPLES 17-23 Portions of the reaction products of Examples 15 and 16 are activated by the addition of sodium hydroxide to give a pH of about 10, aged for /2 hour and then evaluated in hand-sheets according to the general procedure of Example 1. The results of these examples are summarized below in Table II.

TAB LE II Percent Activated resin Wet tensile, Dry tensile, resin added lb./in. width lb./in. width from based Basis Example Example on pulp weight Uncured Cured Uncured Cured EXAMPLE 24 scale, and the reaction is terminated by adding 125 grams of water and grams of aqueous 1 molar hydrochloric acid. The mixture is then heated to 60 C. and additional hydrochloric acid is added, as necessary to maintain the pH at 2.0. The resulting product solution contains 10.4% solids and has a Brookfield viscosity of 11 cps.

EXAMPLE 16 Part 1.-A terpolymer of N-methyldiallylamine hydrochloride, acrylamide and sulfur dioxide is prepared according to the procedure of Example 3, Part 1, except that the reaction flask contains a solution of 26.4 grams of N-methyldiallylamine hydrochloride, 12.4 grams of acrylamide and 11.2 grams of sulfur dioxide in 440 grams of acetone, 0.6 gram of tert-butyl hydroperoxide catalyst as a 5% solution in acetone is used, the reaction temperature is maintained at 23 to 28 C. during the catalyst addition, and the reaction mixture is stirred for an additional hour at 25 to 26 C. The product (45 grams) is water-soluble and has an RSV of 0.35 (determined on a 0.1% solution in aqueous 0.1 molar sodium chloride at 25 C.). The reaction mixture is filtered and the solid product is thoroughly washed with methanol. The white powdery polymeric product is then dried overnight at 45-50 C. in a vacuum oven and amounts to 45 grams. The terpolymer so obtained contains 43.6% of the N-methydiallylamine hydrochloride units.

Part 2.--A resin of epichlorohydrin and the terpolymer of N-methyldiallylamine hydrochloride, acrylamide and sulfur dioxide is prepared as follows: 20 grams of the A poly(N-methyldiallylamine hydrochloride) having an RSV of 0.16 (measured on a 0.1% solution in aqueous one molar sodium chloride at 25 C.) is prepared according to the procedure of Example 2 to a 10-fold scale up and the polymer (518 grams) is dissolved in 1200 grams of water in a reaction vessel to give a solution having a pH of 0.7. After adjustment of the pH of the solution to 8.5 with one molar aqueous sodium hydroxide, 481 grams of epichlorohydrin and then 307 grams of water are added to the solution, giving 30% reaction solids. The contents of the vessel are heated to 54 to 55 C. and the reaction monitored by Gardner-Holdt viscosity tubes. When the viscosity has reached C+ on the Gardner-Holdt scale minutes) the reaction medium is diluted to give a resin solution of 5.4% total solids and the resin solution is adjusted to a pH of 3.0 with one molar hydrochloric acid. A portion of the above resin solution (190.5 grams) is oven dried at C. for 3 hours, giving 5.4 grams of a brittle orange-yellow solid which is sensitive to moisture and readily soluble in water.

The product of this example is evaluated in handsheets according to the procedure of Example 1 using (A) a portion of the resin solution (designated as solution A) and (B) a 4.45% aqueous solution of the dried resin product (designated as solution B), both solutions being activated for use by adjusting the pH to 10 to 11 with sodium hydroxide. The results are summarized below in Table III.

terpolymer prepared in Part 1 of this example is dissolved in 50 grams of water in a reaction flask to give a solution having a pH of 1.3. After adjustment of the pH of What I claim and desire to protect by Letters Patent is: 1 A process comprising (1) reacting in aqueous solution 1 1 (a) a linear polymer wherein from 5 to 100% of the recurring units have the formula Where R is hydrogen or lower alkyl and R is alkyl or a substituted alkyl group wherein the substituent is a group which will not interfere with polymerization through a vinyl double bond and is selected from the group consisting of carboxylate, cyano, ether, amino, amide, hy-

drazide and hydroxyl groups with (b) from about 0.5 to about 1.5 moles of an epihalohydrin per mole of secondary plus tertiary amine present in said polymer at a temperature of about 30 to about 80 C. and a pH from about 7 to about 9.5 to form a water-soluble resinous reaction product containing epoxide groups; and then (2) reacting the resinous reaction product, in aqueous solution, with from about 0.3 equivalents to about 1.2 equivalents per equivalent of epihalohydrin of a water-soluble acid selected from the group consisting of hydrogen halide acids, sulfuric acid, nitric acid,

phosphoric acid, formic acid and acetic acid until the epoxide groups are converted substantially to the corresponding halohydrin groups and an acid-stabilized resin solution is obtained.

2. The process of claim 1 wherein from about 0.25 to about 2.5 equivalents, per equivalent of water-soluble acid, of a base is reacted with the acid-stabilized resin solution of step (2).

3. The process of claim 1 wherein the water-soluble acid employed in step (2) is hydrochloric acid.

4. The process of claim 3 wherein the epihalohydrin is epichlorohydrin.

5. The process of claim 4 wherein the polymer is a copolymer of N-methyldiallylamine and at least one different monomer selected from diallylamines and monoethylenically unsaturated compounds containing a single vinylidene group.

6. The process of claim 4 wherein the polymer is a copolymer of N-methyldiallylamine and sulfur dioxide.

7. The process of claim 5 wherein the polymer is a copolymer of N-methyldiallylamine and dimethyldiallylammonium chloride.

8. The process of claim 5 wherein the polymer is a copolymer of N-methyldiallydamine and arcrylamide.

9. The process of claim 4 wherein the polymer is a terpolymer of N-methyldiallylamine, acrylamide and sulfur dioxide.

10. The process of claim 5 wherein the polymer is a copolymer of N-methyldiallylamine and diallylamine.

11. The acid-stabilized resin solution produced by the process of claim 1.

12. The process of claim 1 wherein the stabilized resin solution of step (2) is dried.

13. The dried resin product produced by the process of claim 12.

14. The process of claim 4 wherein the polymer is the homopolymer of N-methyldiallylamine.

References Cited UNITED STATES PATENTS 3,375,233 3/ 19 68 Harada 260--79.3A 3,515,707 6/1970 Reinschuessel 260-897 N HARRY WONG, JR., Primary Examiner US. Cl. X.R.

162168; 260-296 AT, 65, 79.3 R, 79.3 A, 74.3 MU, 80.3 N, 85.5 AM, 85.7, 86.1 N, 88.3 R, 88.7 A, 89.1, 89.7 R, 89.7 N 

